Take a look at page 54 of this months issue of BodosPower , "Don’t let your Digital StorageOscilloscope betray you"
http://www.bodospower.com/restricted/downloads/bp_2017_07.pdf
Has the author been frozen for the last 30+ years or so? That reads like the rants of some backwarder who never made the mental leap to digital technology.
My "favorites" from a quick glance over this garbage:
While analog scopes are easy to understand and use, DSO’s are extremely complicated, this explains why even electronics engineers miss the stern warning which is implied in the advertisements “max. sampling rate 5 GS/s, bandwidth 500 MHz”...Really, if in 2017 a trained EE misses the fact that stated sample rates in DSO specs are max figures then he's an idiot.
The author took the trouble to download the 200 page manual of a 500 MHz, 5 GS/s model with 10 K memory..Yeah, right, a 500Mhz 5GSa/s scope with 10k memory in 2017
Time to pull out the manual of some old shitty Tek TDS scope from the early '90s to make (another silly) point.
...?DSO’s only show a more or less distorted rough and jittery reconstruction of the signal or artifacts which bear no resemblance to it.OK, so someone obviously doesn't understand sampling theory and has no clue how to operate a digital scope properly
...There are no “Real Time DSO’s”, this term is misleading as it infers that a DSO were able to show a signal in real time. All DSO’s are sampling scopes, one operating mode is called “Real Time Sampling”. When the reconstruction becomes visible on the screen, the signal has long disappeared.Correct, but the same is true for an analog scope
. What this guy misses is that even an analog scopes "samples", which it does by moving the electron beam across the CRT phosphor. Any event that is drawn on the CRT will be drawn with a delay which, while it might be shorter than on a DSO, still means that the analog scope is also not really "real-time".
Oscilloscopes must be designed for a Gaussian frequency response...Nonsense, as pretty much any DSO with bandwidths of 1+Ghz are brickwalled. Which obviously the author doesn't know, as he goes on with a BW/Risetime factor of 0.35 which is valid for Gaussian scopes only.
Reading this it's clear the author doesn't really have a good understanding of digital scopes, which wouldn't be a problem per se (lots of good engineers still work with analog scopes) but becomes one when trying to lecture others with this nonsense. Not saying he might not be a great EE in some field but his appreciation and understanding of digital scopes is clearly beyond hom.
What's worse however is that this article made it through review and ended up being published by Bodo's Power Systems Magazine. They should be embarrassed to publish such drivel in 2017.